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glTexGen

Chapter 18

433

Finally, let m = 2 sqrt(f

+(f

+1)

). Then the values assigned to the s and t texture

coordinates are

s = f

/m + 1/2

t = f

/m + 1/2

To enable or disable a texture-coordinate generation function, call glEnable or glDisable

with one of the symbolic texture-coordinate names (GL_TEXTURE_GEN_S,

GL_TEXTURE_GEN_T, GL_TEXTURE_GEN_R, or GL_TEXTURE_GEN_Q) as the

argument. When enabled, the speciﬁed texture coordinate is computed according to the

generating function associated with that coordinate. When disabled, subsequent vertices

take the speciﬁed texture coordinate from the current set of texture coordinates.

Initially, all texture generation functions are set to GL_EYE_LINEAR and are disabled.

Both s plane equations are (1, 0, 0, 0), both t plane equations are (0, 1, 0, 0), and all r and

q plane equations are (0, 0, 0, 0).

Errors

• GL_INVALID_ENUM is generated when coord or pname is not an accepted deﬁned

value, or when pname is GL_TEXTURE_GEN_MODE and params is not an

accepted deﬁned value.

• GL_INVALID_ENUM is generated when pname is GL_TEXTURE_GEN_MODE,

params is GL_SPHERE_MAP, and coord is either GL_R or GL_Q.

• GL_INVALID_OPERATION is generated if glTexGen is executed between the

execution of glBegin and the corresponding execution of glEnd.

Associated Gets

glGetTexGen

glIsEnabled with argument GL_TEXTURE_GEN_S

glIsEnabled with argument GL_TEXTURE_GEN_T

glIsEnabled with argument GL_TEXTURE_GEN_R

glIsEnabled with argument GL_TEXTURE_GEN_Q

HP b2600 Reference Guide

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